Finding the Third Proportional to 21,384 and 43,608

Step by Step Solution

1. Step 1: Write the proportion equation
   21,384 : 43,608 = 43,608 : x
2. Step 2: Convert to fraction form
   21,384/43,608 = 43,608/x
3. Step 3: Cross multiply
   21,384x = 43,608 × 43,608
4. Step 4: Simplify right side
   21,384x = 1,901,657,664
5. Step 5: Solve for x
   x = 1,901,657,664/21,384
6. Step 6: Final answer
   x = 88,929.00